1. a The Department of Health Promotion and Education , School of Public Health, University of South Carolina , Columbia , SC , 29208 , USA
2. b Health Education Division , Forsyth County Health Department , Winston-Salem , NC , 27102 , USA
3. c The Department Health and Human Performance , University of Houston , Houston , TX , 77204 , USA
4. d The Department of Health Behavior and Health Education , School of Public Health, University of North Carolina , Chapel Hill , NC , 27599 , USA